CN108616472B - Amplitude modulation method and amplitude modulation device - Google Patents
Amplitude modulation method and amplitude modulation device Download PDFInfo
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- CN108616472B CN108616472B CN201810135206.3A CN201810135206A CN108616472B CN 108616472 B CN108616472 B CN 108616472B CN 201810135206 A CN201810135206 A CN 201810135206A CN 108616472 B CN108616472 B CN 108616472B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/08—Amplitude regulation arrangements
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Abstract
An amplitude modulation method for an analog attenuator comprises the steps of obtaining a digital signal of a modulation waveform, carrying out digital pre-distortion treatment, generating an analog modulation signal and executing amplitude modulation. In addition, according to the amplitude modulation device constructed by the amplitude modulation method, a direct digital frequency synthesizer, a digital predistortion processor and a digital-to-analog converter are adopted as a generation unit of the modulation signal, so that the generation unit has the capacity of receiving and processing the signal in a full digitalization manner, the modulation signal with higher precision can be obtained, and the problems of complex circuit layout and limited adaptive signal frequency existing in an analog predistortion circuit can be avoided in the processing form of a digital chip.
Description
Technical Field
The present invention relates to an amplitude modulation technique, and in particular, to an amplitude modulation method and an amplitude modulation apparatus.
Background
The Modulation technique is a process of converting a signal generated by a signal source into a form suitable for wireless transmission, and can be divided into an analog Modulation process and a digital Modulation process, wherein Amplitude Modulation (AM Modulation for short) is one of important means of analog Modulation. Amplitude modulation is widely used in wire-line or radio communication and broadcasting, which causes the amplitude of a carrier wave to vary according to the variation law of a desired transmission signal, with the frequency of the carrier wave signal being constant.
Currently, an analog attenuator is often used to perform amplitude modulation on a microwave signal to extend the amplitude modulation range of a carrier wave, as shown in fig. 1. A direct digital frequency synthesizer (DDS for short) and a digital-to-analog converter (DAC for short) are adopted to generate original modulation signals, the original modulation signals are processed by an analog pre-distortion processing module to generate modulation signals, and the modulation signals control an analog attenuator to perform amplitude modulation on carrier signals so as to control the amplitude of carrier waves. Because of the serious nonlinear relation between the attenuation of the analog attenuator and the control signal, the original modulation signal can not be directly used for controlling the analog attenuator, and the analog predistortion processing module is adopted for carrying out predistortion processing on the control signal. When the analog predistortion processor is adopted, the original modulation signal is subjected to an analog quantity signal processing process, a modulation signal with higher precision cannot be obtained, the problems that the harmonic distortion of the analog attenuator is large, the design of the analog predistortion circuit is complex, the analog predistortion circuit cannot adapt to modulation signals of each frequency band of the analog attenuator, and the temperature drift of the analog predistortion circuit exists are often caused.
Disclosure of Invention
The invention mainly solves the technical problem of how to improve the harmonic distortion phenomenon of the analog attenuator caused by the analog distortion processing module in the amplitude modulation process. In order to solve the above problems, the present invention provides an amplitude modulation method and an amplitude modulation apparatus.
According to a first aspect of the present application, there is provided an amplitude modulation method comprising:
acquiring a digital signal of a modulation waveform;
carrying out digital pre-distortion processing on the digital signal;
performing digital-to-analog conversion on the digital signal subjected to digital pre-distortion processing to obtain an analog modulation signal;
the analog modulation signal is input to a control end of an analog attenuator so as to carry out amplitude modulation on the analog carrier signal input from the input end of the analog attenuator through the analog attenuator and output an analog amplitude modulation signal through the output end of the analog attenuator.
According to a second aspect of the present application, there is provided an amplitude modulation apparatus comprising:
a direct digital frequency synthesizer for outputting a digital signal of a modulation waveform;
the digital predistortion processor is used for receiving the digital signal and carrying out digital predistortion processing on the digital signal;
the digital-to-analog converter is used for performing digital-to-analog conversion on the digital signal subjected to the digital pre-distortion processing to obtain an analog modulation signal;
and the control end of the analog attenuator is used for receiving the analog modulation signal so as to carry out amplitude modulation on the analog carrier signal input by the input end of the analog attenuator and output an analog amplitude modulation signal through the output end.
The beneficial effect of this application is:
according to the amplitude modulation method of the embodiment, the steps of obtaining the digital signal of the modulation waveform, carrying out digital pre-distortion processing, generating the analog modulation signal and executing amplitude modulation are included, and the method of adopting the digital pre-distortion processing replaces the method of the analog pre-distortion processing in the prior art, so that the generated modulation signal has higher modulation precision, and the harmonic distortion phenomenon of the analog attenuator can be effectively improved. In addition, an amplitude modulation device constructed according to the amplitude modulation method adopts a direct digital frequency synthesizer, a digital predistortion processor and a digital-to-analog converter as a generation unit of a modulation signal, so that the generation unit has the capability of receiving and processing the signal in a full digitalization manner, not only can obtain the modulation signal with higher precision, but also can avoid the problems of complex circuit layout and limited adaptive signal frequency existing in an analog predistortion circuit in the processing form of a digital chip, and simultaneously can also avoid the temperature drift problem caused by individual signal processing elements in the analog predistortion circuit.
Drawings
FIG. 1 is a schematic diagram of a prior art amplitude modulation apparatus;
fig. 2 is a schematic structural diagram of an amplitude modulation apparatus;
fig. 3 is a schematic structural diagram of another amplitude modulation apparatus;
fig. 4 is a schematic structural diagram of still another amplitude modulation apparatus;
fig. 5 is a flow chart of an amplitude modulation method.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
An analog attenuator is an electronic component providing attenuation, is widely applied to electronic equipment, and belongs to the prior art. Analog attenuators have two main uses: on the one hand for adjusting the signal size in the circuit and on the other hand for improving the impedance matching in the circuit to obtain a stable load impedance. An existing analog attenuator generally has a carrier input terminal, a modulation control terminal, and a modulation output terminal, where the carrier input terminal is used to input a carrier signal to be attenuated, the modulation control terminal is used to input a modulation signal for amplitude modulation of the carrier signal, and the modulation output terminal is used to simulate an amplitude modulation signal (i.e., the carrier signal after amplitude modulation).
The process of amplitude-modulating the carrier signal with an analog attenuator can be understood as being the use of the modulation signal UΩ(t) to control the carrier signal Uc(t) amplitude of vibration, making carrier signal Uc(t) amplitude of vibration in accordance with modulation signal UΩThe regularity of (t) is changed. The resulting analog amplitude-modulated signal can be expressed as:
UΩ'(t)＝Uc(Ec+UΩcos(Ωt))cos(ωct)
in the above formula, UcRepresenting the carrier amplitude, the expression of the carrier signal is Uc(t)＝Uccos(ωct)；UΩRepresenting the modulation amplitude, the expression of the modulated signal is UΩ(t)＝Ec+UΩcos (Ω t). The analog amplitude modulation signal is the product of the modulation signal and the carrier signal as viewed by the mathematical equation in the equation.
A Direct Digital Synthesizer (DDS) is a key Digital frequency generator, which is used to synthesize Digital signals of any frequency (including Digital signals of modulation waveforms for amplitude modulation), and belongs to the prior art. DDS generally includes a signal source and a waveform data generator, wherein the signal source may be a clock for generating a periodic signal with a specific frequency, and the function waveform generator generates a user-defined function waveform or a fixed waveform with an adjustable frequency (common fixed waveforms include sine wave, square wave, step wave, and sawtooth wave) by querying a data table (the data table is used for storing a function waveform of a complete period) under the action of an excitation signal of the signal. Compared with the traditional frequency synthesizer, the DDS has the advantages of low cost, low power consumption, high resolution, quick switching time and the like, and is widely used in the fields of telecommunications and electronic instruments. The DDS further includes a digital-to-analog conversion element, and can convert the synthesized digital signal into an analog signal having a corresponding frequency and amplitude.
A digital-to-analog converter, which is a device for converting digital quantity into analog quantity, belongs to the prior art and is not described in detail herein.
The present application discloses an amplitude modulation apparatus, as shown in fig. 2.
The amplitude modulation apparatus includes a direct digital frequency synthesizer 101 (alternatively referred to as DDS), a digital predistortion processor 102, a digital-to-analog converter 103 (alternatively referred to as DAC), and an analog attenuator 104. As will be described separately below.
The direct digital frequency synthesizer 101 is used to send a digital signal of the modulated waveform to the digital predistortion processor 102. The specific process of the direct digital frequency synthesizer 101 for generating the digital signal of the modulation waveform is as follows: the direct digital frequency synthesizer 101 generates a periodic excitation signal by using an internal clock, the internal function waveform generator queries its own data table according to a function waveform set by a user and under the action of the excitation signal, and outputs waveform data of the waveform function after finding a corresponding waveform function in the data table, and the waveform data reaches the digital predistortion processor 102 in a digital form.
The digital predistortion processor 102 is in signal connection with the direct digital frequency synthesizer 101, and is configured to receive the digital signal of the modulation waveform and perform digital predistortion processing on the digital signal. The digital predistortion processor 102 presets the relationship between the control terminal voltage of the analog attenuator 103 and the signal amplitude corresponding to the output terminal, and performs digital predistortion processing on the digital signal according to the relationship when performing digital predistortion processing on the digital signal. The process of digital predistortion processing can be described as: the digital predistortion processor 102 calculates the acquired digital signal of the modulation waveform as an independent variable of a curve equation corresponding to the relationship, and obtains a dependent variable of the curve equation as a digital signal subjected to digital predistortion processing.
The digital-to-analog converter 103 is in signal connection with the digital predistortion processor 102, and is configured to perform digital-to-analog conversion on the digital signal subjected to the digital predistortion processing to obtain an analog modulation signal. The analog modulation signal is in the form of an analog signal, and can meet the signal form requirement of the modulation control end of the analog attenuator 104.
The control end of the analog attenuator 104 is in signal connection with the analog-to-digital converter 103, and is configured to receive the analog modulation signal to perform amplitude modulation on the analog carrier signal input at the input end thereof, and output an analog amplitude modulation signal through the output end. In a specific embodiment, a sine wave signal of a certain frequency is preferably used as the analog carrier signal. The analog attenuator 104 loads the analog modulation signal into the analog carrier signal to generate an analog amplitude modulation signal, the period of the analog amplitude modulation signal is consistent with the analog modulation signal, and the vibration amplitude changes according to the amplitude rule of the analog modulation signal.
Further, in order to preset the relationship between the control terminal voltage of the analog attenuator 104 and the signal amplitude corresponding to the output terminal in the digital predistortion processor 102, the amplitude modulation apparatus further includes a presetting unit 105 for obtaining the relationship between the control terminal voltage of the analog attenuator 104 and the signal amplitude corresponding to the output terminal, please refer to fig. 3. In one embodiment, the presetting unit 105 includes a power harvester 1051 and a relationship processing module 1052, as described below.
The power collector 1051 is disposed at the modulation output end of the analog attenuator 104, and is used for collecting the output power of the analog amplitude modulation signal of the analog attenuator 104. When the digital-to-analog converter 103 sends a plurality of analog dc signals with different voltage values to the control end of the analog attenuator 104 in advance, the power collector 1051 obtains the power of the signal corresponding to the output end when each analog dc signal is input to the control end of the analog attenuator, and sends the obtained power to the relationship processing module 1052 in sequence.
The relation processing module 1052 is in signal connection with the power collector 1051 and the digital predistortion processor 102, and is configured to generate a relation between a control end voltage of the analog attenuator 104 and a signal amplitude corresponding to an output end according to an output power of the analog amplitude modulation signal, and to preset the relation in the digital predistortion processor 102. The relation processing module 1052 calculates the amplitude of the analog amplitude modulation signal output by each analog dc signal when being input at the control end of the analog attenuator 104 according to the received power, so as to obtain the signal amplitudes corresponding to the voltage of the control end and the output end of the analog attenuator 104, fits the signal amplitudes corresponding to the voltage of the control end and the output end of the analog attenuator 104, obtains the relation between the signal amplitudes corresponding to the control end and the output end of the analog attenuator 104, and presets the relation in the digital predistortion processor 102. In an embodiment, the process of the relationship processing module 105 fitting the voltages at the control terminal and the signal amplitudes at the output terminal of the analog attenuator 104 can be described as follows: and performing curve fitting on the voltages of the control ends of the analog attenuators and the signal amplitudes corresponding to the output ends to obtain a curve equation, wherein the signal amplitude corresponding to the output end is used as an X-axis independent variable, the voltage of the control end is used as a Y-axis dependent variable, and the curve equation is used as the relation between the voltage of the control end of the analog attenuator 104 and the signal amplitude corresponding to the output end.
In another embodiment, the relationship processing module 1052 in the presetting unit 105 is integrated in the digital predistortion processor 102 and forms a functional unit of the digital predistortion processor 102, please refer to fig. 4. The design can further simplify the hardware structure of the amplitude modulation device, and can expand the functions of the digital predistortion processor 102, thereby providing convenience for users to operate.
The present application also proposes an amplitude modulation method, as shown in fig. 5, which includes the following steps.
S201, acquiring a digital signal of a modulation waveform.
Referring to fig. 2, the direct digital frequency synthesizer 101 is configured to output a digital signal of a modulation waveform customized by a user, where the digital signal is waveform data having a specific function waveform, such as sine wave data, square wave data, step wave data, or sawtooth wave data, and the specific waveform data of the digital signal is not limited herein.
S202, digital predistortion processing is performed on the digital signal of the modulation waveform.
In this step, the method includes the step of obtaining in advance a plurality of signal amplitudes corresponding to the voltage at the control end of the analog attenuator 104 and the output end to obtain a relationship between the voltage at the control end of the analog attenuator 14 and the signal amplitude corresponding to the output end, and according to the relationship, performing digital predistortion processing on the digital signal of the modulation waveform in step S201.
The step of obtaining the relationship between the control end voltage of the analog attenuator 14 and the corresponding signal amplitude of the output end includes the following steps:
(1) the output power of the analog amplitude-modulated signal is measured. Referring to fig. 3, the relationship processing module 1052 in the preset unit sequentially sends digital dc signals with a plurality of different amplitude values to the digital-to-analog converter 103 through the digital predistortion processor 102, and the digital-to-analog converter 103 sequentially outputs analog dc signals with different voltage values to the analog attenuator 104 after receiving the digital dc signals. The analog attenuator 104, when input with each analog dc signal at its input, loads the analog dc signal onto an analog carrier signal (preferably a sine wave signal) and generates an analog amplitude modulated signal of fixed amplitude. At this time, the power collector 1051 sequentially collects the power of each analog amplitude modulation signal with fixed power, and sequentially transmits the collection result of each power to the relationship processing module 1052 in the form of digital signal.
(2) The output power is converted to a signal amplitude. The relation processing module 1052 sequentially receives the output power in the link (1) and performs data processing on the output power, and converts each power into a corresponding signal amplitude, thereby obtaining a plurality of pairs of voltage of the control end of the analog attenuator 104 and signal amplitudes corresponding to the output end. The conversion ratio relation between the power and the signal amplitude is set by a user in a self-defined way, and no further limitation is carried out.
(3) And (5) performing curve fitting to obtain a curve equation of the predistortion treatment. And performing curve fitting on the voltages of the control ends of the analog attenuators 104 and the signal amplitudes corresponding to the output ends to obtain a curve equation, wherein the curve equation is used as the relation between the voltage of the control ends of the analog attenuators and the signal amplitudes corresponding to the output ends. Since curve fitting belongs to the prior art, it will not be described in detail here.
The obtained curve equation directly reflects the corresponding relation between the modulation control terminal voltage and the modulation output terminal power of the analog attenuator 104, and indirectly shows the attenuation characteristic of the analog attenuator 104. In order to ensure the operation effect of curve fitting and enhance the accuracy of the analog predistortion equation, a certain amount of relational data should be used for curve fitting operation, and therefore, it is preferable to obtain at least 20 pairs of the relation between the control end voltage of the analog attenuator and the signal amplitude corresponding to the output end.
(4) A curve equation is preset. The digital predistortion processor 102 obtains the curve equation in step S203 from the relationship processing module 1052 and presets the curve equation in the digital predistortion processor 102.
The above-mentioned links (1) to (4) describe in detail the process of obtaining and presetting the curve equation, which is also the process of presetting the relationship between the control terminal voltage of the analog attenuator 104 and the corresponding signal amplitude of the output terminal, and this process is mostly used in the parameter correction stage of the amplitude modulation apparatus, such as factory setting, initialization setting, and the like. When the curve equation is preset in the amplitude modulation device, the amplitude modulation device is directly used for amplitude modulation, and the steps (1) to (4) are not required to be executed.
Next, the digital modulation signal in step S201 will be subjected to digital predistortion processing according to the relationship, and the process of the digital predistortion processing can be described as: the digital predistortion processor 102 receives the digital signal in step S201, obtains each data point of the digital signal, reads each data point, and substitutes each data point as a parameter X-axis independent variable into the curve equation in sequence to obtain a corresponding Y-axis dependent variable, where the obtained continuous Y-axis dependent variable is the digital signal subjected to digital predistortion processing.
S203, an analog modulation signal is generated.
The digital-to-analog converter 103 receives the digital signal that has been subjected to the digital predistortion processing in step S206 and performs analog-to-digital conversion to generate an analog modulation signal. .
And S204, outputting the analog modulation signal and carrying out amplitude modulation.
The digital-to-analog converter 103 outputs an analog modulation signal to the modulation control end of the analog attenuator 104, and the analog attenuator 104 loads the analog modulation signal into the analog carrier signal and generates an analog amplitude modulation signal, thereby performing amplitude modulation on the analog carrier signal.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. An amplitude modulation method, characterized by comprising the steps of:
acquiring a digital signal of a modulation waveform;
carrying out digital pre-distortion processing on the digital signal; the method specifically comprises the following steps: pre-obtaining the voltage of a control end of a plurality of pairs of analog attenuators and the signal amplitude corresponding to an output end so as to obtain the relationship between the voltage of the control end of the analog attenuator and the signal amplitude corresponding to the output end; carrying out digital pre-distortion processing on the digital signal according to the relation;
performing digital-to-analog conversion on the digital signal subjected to digital pre-distortion processing to obtain an analog modulation signal;
the analog modulation signal is input to a control end of an analog attenuator so as to carry out amplitude modulation on the analog carrier signal input from the input end of the analog attenuator through the analog attenuator and output an analog amplitude modulation signal through the output end of the analog attenuator.
2. The amplitude modulation method of claim 1, wherein the pre-obtaining the voltage of the control terminal of the analog attenuator and the signal amplitude corresponding to the output terminal to obtain the relationship between the voltage of the control terminal of the analog attenuator and the signal amplitude corresponding to the output terminal comprises:
sequentially sending a plurality of analog direct current signals with different voltage values to a control end of the analog attenuator in advance;
respectively acquiring the signal amplitude corresponding to the output end when each analog direct current signal is input into the control end of the analog attenuator so as to obtain the voltage of the control end of the analog attenuator and the signal amplitude corresponding to the output end;
and fitting the voltages of the control ends of the analog attenuators and the signal amplitudes corresponding to the output ends to obtain the relation between the voltage of the control ends of the analog attenuators and the signal amplitudes corresponding to the output ends.
3. The amplitude modulation method of claim 2, wherein obtaining the signal amplitude corresponding to the output terminal when each analog dc signal is input to the control terminal of the analog attenuator respectively comprises: and respectively obtaining the power of a signal corresponding to the output end when each analog direct current signal is input to the control end of the analog attenuator, and calculating according to the power of the signal to obtain the amplitude of the signal.
4. The amplitude modulation method of claim 2, wherein the fitting the voltages of the control terminals of the analog attenuators to the signal amplitudes corresponding to the output terminals to obtain the relationship between the voltages of the control terminals of the analog attenuators and the signal amplitudes corresponding to the output terminals comprises: and performing curve fitting on the voltages of the control ends of the analog attenuators and the signal amplitudes corresponding to the output ends to obtain a curve equation as the relation.
5. The amplitude modulation method of claim 4, wherein the digitally pre-distorting the digital signal according to the relationship comprises: and calculating by taking the acquired digital signal of the modulation waveform as an independent variable of the curve equation, and taking the obtained dependent variable of the curve equation as a digital signal subjected to digital pre-distortion treatment.
6. An amplitude modulation apparatus, comprising:
a direct digital frequency synthesizer for outputting a digital signal of a modulation waveform;
the digital predistortion processor is used for receiving the digital signal and carrying out digital predistortion processing on the digital signal; the digital predistortion processor is preset with the relation between the control end voltage of the analog attenuator and the signal amplitude corresponding to the output end, and when the digital signal is subjected to digital predistortion processing, the digital predistortion processor is used for performing digital predistortion processing on the digital signal according to the relation;
the digital-to-analog converter is used for performing digital-to-analog conversion on the digital signal subjected to the digital pre-distortion processing to obtain an analog modulation signal;
and the control end of the analog attenuator is used for receiving the analog modulation signal so as to carry out amplitude modulation on the analog carrier signal input by the input end of the analog attenuator and output an analog amplitude modulation signal through the output end.
7. An amplitude modulation device as claimed in claim 6, characterized in that it further comprises a presetting unit;
the digital-to-analog converter sequentially sends a plurality of analog direct current signals with different voltage values to the control end of the analog attenuator in advance;
the preset unit respectively obtains the signal amplitude corresponding to the output end when each analog direct current signal is input into the control end of the analog attenuator so as to obtain the voltage of the control end of the analog attenuator and the signal amplitude corresponding to the output end, fits the voltage of the control end of the analog attenuator and the signal amplitude corresponding to the output end to obtain the relation between the voltage of the control end of the analog attenuator and the signal amplitude corresponding to the output end, and presets the relation in the digital predistortion processor.
8. The amplitude modulation device according to claim 7, wherein the presetting unit fits the voltages at the control terminals of the plurality of pairs of analog attenuators and the signal amplitudes corresponding to the output terminals to obtain the relationship between the voltage at the control terminals of the analog attenuators and the signal amplitudes corresponding to the output terminals, and takes the signal amplitude corresponding to the output terminals as an X-axis independent variable and the voltage at the control terminals as a Y-axis dependent variable, and performs curve fitting on the voltages at the control terminals of the plurality of pairs of analog attenuators and the signal amplitudes corresponding to the output terminals to obtain a curve equation as the relationship.
9. An amplitude modulation apparatus according to claim 8, wherein said digital predistortion processor performs digital predistortion processing on said digital signal in accordance with said relationship, and calculates said acquired digital signal as an independent variable of said curve equation, and obtains a dependent variable of said curve equation as a digital signal subjected to digital predistortion processing.
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